Evaporator.



Nrrnn snares PATENT @FFIGE.

FRITZ SQH'ULZ, OF W'EETZEN, GERMANY,

EVAPORATOR meanest.

provide an improved means for heating evaporators.

The arrangement of tubes in the interior of evaporators as heretoforeproposed has the disadvantage that the tubes hinder the process anddisturb by incrustation the boiling process when the level of the quidto be evaporated is low. It is also di cult to remove the incrustation.

In order to avoid the use of tubes it has been proposed to provideevaporators with double bottoms, or to cast or arrange the tubes in thewalls of the evaporating vessel. All these arrangements have, however,the drawback that the utilization of the heat from the heating medium isinefficient owing to the thickness of the walls and bottom of theevaporator rendered necessary for safe workin conditions andpractical-manufacture. t is well known that these large dimensionsseriously impair the etficiency of the medium used for heating theevaporator, since most of the heat is lost in heating the large massesof metal before penetrating the latter in order to reach the contents ofthe evaporator.

According to the present invention the greatest cross sectional surfaceof the heatingchannels face the interior of the evaporator, saidchannels being closed by a thin piece of metal of approximately 2millimeters in thickness and welded in position in such a manner thatthey lie flush with the bottom or sides of the evaporating vessel.

In this manner the heat is transmitted to the I interior of said vesselin an eflicient manner irrespective of the thickness of the walls. Thebrine or other liquid is thus caused to contact with the greatestsurface of the heating channels covered by very thin covers,

- Specification of Lettersjtatent.

'uneconomical.

Patented Mar. 31, 1914.

Application filed. August 15, 1912. Serial No. 715,178.

with the result that evaporation is 1 much more rapid than is the casewhen the heating medium has to pass through thick masses of metal beforereaching the li mid to be evaporated.- The eflicienc may" e increased bylining the bottom 0 the heating channels Iwith a material which is a'badconductor of The invention is a plicable to pans, boilers, and apparatus0 all descriptions adapted to be heated by steam or gas, and in whichfalse bottoms or cast in tubes have proved An embodiment of theinvention is shown in the accompanying drawing, in which:

Figure 1 is a iagrammatic planview and Fig. 2 a sectional perspectiveview on an enlarged scale. a

The metal plate, wall or base a is provided with a system of channels I)doubling back upon themselves and open at the top. These channels arecovered by thin plates 0 which are welded into grooves formed in theplate a at the upper edges of the channels I), so that the top of platea and the thin plates 0 lie flush with one another. In Fig. 1 thechannels I) are diagrammatically indicated by lines. The total surfaceof said channels I) should correspond to the particular heating surfacerequired.

The arrangement described may be applied to the sides of the evaporator.as well as to the bottom of the same. The cross section of the channelsI) may be other than semicircular as shown in the drawing.

What I claim is: An evaporator comprising a base plate provided with asystem of communicating heating channels, having grooved edges and' faceof the base plate.

\ FRITZ SCHULZ. Witnesses:

T. HENSLY REED, MINNA CAssELL.

